Using an ambulance that included a computed tomography (CT) scanner, point-of-care laboratory, telemedicine connection and a specialized prehospital stroke team resulted in decreased time to treatment for ischemic stroke, ...

An ultrafast, 320-detector computed tomography (CT) scanner that shows both anatomy within coronary arteries and blood flowcan accurately sort out which people need – or don't need – an invasive procedure to identify ...

Radiation dose reduction has moved to the forefront of importance in medical imaging with new techniques being developed in an effort to bring doses down as low as possible. What difference can these techniques make? Researchers ...

From Junior Seau, former San Diego Chargers linebacker, to Dave Duerson, former Chicago Bears safety—who both committed suicide as a result of chronic traumatic encephalopathy (CTE)—traumatic brain injuries (TBIs) have ...

Researchers using a newly approved advanced computed tomography (CT) system were able to significantly reduce radiation exposure in patients undergoing coronary CT angiography (CCTA), according to a new study published online ...

(Medical Xpress)—Researchers at the University of Calgary are hoping to help people with osteoporosis by predicting which patients are more likely to fracture their bones. Having this information would better allow doctors ...

An ultra-fast, 320-detector computed tomography (CT) scanner can accurately sort out which people with chest pain need – or don't need – an invasive procedure such as cardiac angioplasty or bypass surgery to restore blood ...

Computed tomographic colonography (CTC), also known as virtual colonoscopy, administered without laxatives is as accurate as conventional colonoscopy in detecting clinically significant, potentially cancerous polyps, according ...

New guidelines for CT-guided biopsies of lung nodules significantly reduce radiation exposure allowing individuals the benefit of the procedure, which may cut down on overall lung cancer deaths. This research is being presented ...

The analysis of 180 CT angiography studies done using a 320 detector row CT scanner found that a contrast media protocol based on 60 milliliters of iopamidol "had sufficient enhancement in more than 96% of coronary segments," ...

In an effort to reduce the radiation dose delivered by computed tomography (CT) scans, staff at a community-based hospital developed a comprehensive CT radiation dose reduction program which has allowed them to reduce the ...

The use of breast shields is the technique of choice to protect the breasts of women from radiation exposure while undergoing chest CT examinations, according to a new study.

May 04, 2011

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Computed tomography

Computed tomography (CT) is a medical imaging method employing tomography. Digital geometry processing is used to generate a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. The word "tomography" is derived from the Greek tomos (slice) and graphein (to write). Computed tomography was originally known as the "EMI scan" as it was developed at a research branch of EMI, a company best known today for its music and recording business. It was later known as computed axial tomography (CAT or CT scan) and body section röntgenography.

CT produces a volume of data which can be manipulated, through a process known as "windowing", in order to demonstrate various bodily structures based on their ability to block the X-ray/Röntgen beam. Although historically the images generated were in the axial or transverse plane, orthogonal to the long axis of the body, modern scanners allow this volume of data to be reformatted in various planes or even as volumetric (3D) representations of structures. Although most common in medicine, CT is also used in other fields, such as nondestructive materials testing. Another example is the DigiMorph project at the University of Texas at Austin which uses a CT scanner to study biological and paleontological specimens.